TTNCTL CLI Selfupdate failure

I’m seeing this when I execute TTNCTL SELFUPDATE … any ideas?

C:\Users\pmolloy\Downloads\ttnctl-windows-amd64>ttnctl selfupdate
INFO The build on the server is 4011h59m16s newer than yours
INFO Downloading the latest ttnctl…
FATAL Could not download latest binary error=gzip: invalid header